 
|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
|
|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
12.72.208.228
In Reply to: RE: Poll: agree or disagree - "You can't replace a volume pot with a single resistor." posted by hukkfinn on January 30, 2010 at 08:22:06
I don't think it's completely clear what you had done. In your original post you said it was bypassed, and here you say replaced. Was the intent to remove the VC and have it set to a specific volume using a fixed resistor? If so, Al is correct, you would need a voltage divider with 2 resistors. However, it is also likely that the amp stage following the VC had a input resistor too, so could be used as the shunt leg, albeit with a resistor value that would likely be higher than optimum, and may lead to frequency response changes due to interaction with the input impedances of the following stage. Or most likely, the pot could've been left in and rewired as the shunt leg. That would've been a poor choice though, since the pot would still be part of the circuit, so little would be gained by using the fixed resistor, though it shouldn't degrade the sound too much if done correctly. It would still have a higher series resistance than you had before for the same volume, so there may be some high frequency rolloff depending on the input capacitance of the next stage.
Edits: 01/30/10Follow Ups:
No.
Was the intent to
remove the VC and have it set to a specific volume using a fixed resistor?
Yes.
Your post may be exactly what I need in order to confirm with the modder that he did correct work. I'm sorry, I don't have enough expertise to differentiate between replacing the vol pot and bypassing it. All I know is that it's now a fixed volume. It was intended to be fixed at about half the maximum gain.
Hukk
If the attenuation is not variable and the attenuation has been set via the modification to "half gain" then your circuit has a fixed voltage divider with approximately equal value series and shnt resistors. If the shunt leg of the pot was parallel to a fixed shunt resistor then the pot could be lifted out and a single fixed series resistor soldered in. This would be scaled to give you the desired attenuation BUT will change the impedence of the voltage divider compared to the pot, (which may or may not be important depending onm the circuit).
Post a Followup:
| FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
||||||||||||||
This post is made possible by the generous support of people like you and our sponsors:
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2025, Audio Asylum, all rights reserved ]
